unit 4 aero

wash in/wash out

built in twist in wing so that the trailing edge at the wingtip is raised (wash out) or lowered (wash in) affects the slow flight and stall characteristics of the wing

boundary layers

thin layer of air next to the surface of an airfoil which shows a reduction in speed due to the air’s viscocity

moon

natural satellite of a planet

MSL

mean sea level

NDB

non directional beacon. LMF or UHF radio beacon transmitting non-directional signals where the pilot of an aircraft equipped with direction finding equipment can determine their bearing to or from radio beacon and “home” to or from the station

NGO

non-govt. organization

deformation

alteration of shape or dimension of a body caused by external forces. like stress, thermal expansion or contraction, chemical or metallurgical transformations, or shrinkage and expansions due to moisture change

open loop system

control circuit in which the system output has no effect on the control

output

info. produced by a computer

moment of intertia

mathematical property of cross-section that’s concerned with a surface area and how that is distributed about a centroidal axis

pedigree

point in orbit that’s closest to earth

switch

device that breaks, makes, or changes connections in an electrical circuit

photopic vision

use of color-sensitive cones for direction vision in good light

pilotage

navigation by visual references to landmarks

pitch

motion around lateral axis caused by deflection in elevator controlled by moving yoke forward and aft

power stroke

when spark plug fires and compressed mixture ignites to begin power stroke

propellant

mixture of fuel and oxidizer that burns to create rocket thrust

pupil

opening in the iris, allows light into interior of vertebrae eye; muscles in iris regulate its size

resilience

mechanical property of material that shows how effective material is at absorbing mechanical energy without permanent damage

retina

sensory membrane that lines most of large posterior chamber of eye; composed of several layers like rods and cones, functions as immediate instrument of vision. lens → converts to chemical and nervous signals → optic nerve → brain

reynolds number

ratio of inertial forces to viscous forces (fluid’s resistance to flow)

right ascension of the ascending node

RAAN. angle measured along equatorial plane between a vector pointing to a fixed reference point in space & the orbit where orbital motion is from south to north across equator

turbojet

type of gas turbine engine w no bypass

syntax

set of rules that defines combinations of symbols to correctly structure grammar & spelling of text-based programming lang.

TACAN

tactical air navigation ultra-high frequency electrical rho-theta air navigation aid. provides indication of bearing & distance to TACAN station

turboprop

turbo jet engine that has a propeller mounted on the shaft ahead of the inlet